烯

Present status and application of isoprene,cyclopentadiene and m-pentadiene in cracking C_5 fraction products were reviewed.

重点介绍了国内外裂解C5分离产物异戊二烯、环戊二烯和间戊二烯利用近况，提出C5综合利用具有很广阔的发展前景和现实意义。

The results showed: at the reaction temperature of 25～30 ℃,hydrogen pressure of 1.0～1.5 MPa,Vethanol∶Vcyclopentadiene of 5～6∶1,the catalyst dosage of 4 %～5 % and stirring rate of 800 r/min.The conversion of cyclopentadiene was above 98% and the selec...

结果表明，在反应温度25-30℃，氢气分压为1.0-1.5 MPa，无水乙醇作为溶剂，V无水乙醇∶V环戊二烯为5-6∶1，催化剂用量为4%-5%，搅拌速度为800 r/min条件下，反应时间2~3 h，环戊二烯的转化率大于98%，环戊烯的选择性大于95%。

By simulation, the optimal operation conditions were gained in every step in the separation process, and polymerization-class isoprene was gained by the process. And to improve the economy of process, the process was studied by simulation, 99% cyclopentene and 1, 3-pentadiene were gained by continuous separation process. All were the base of the process industrialization.

通过模拟研究，得到分离各步的最佳塔高，进料位置和各种操作条件；并进行了全流程的模拟优化得到聚合级的异戊二烯的各种工艺参数；通过模拟研究对分离工艺进一步深化，得到了从C5中分离出环戊烯和间戊二烯的优化工艺条件，对工艺经济性进一步优化，给过程工业化提供了依据。

An unprecedented combination of photochromism and solvatochromism for a 1,2-bis cyclopentene derivative,1,2-bis(2-methyl-5-formyl-thien-3-yl) perfluorocyclopentene,is observed:1 BMFTP,dissolved in the alcohols,exhibits the largest positive solvatochromic shift in wavelength witnessed to date.

我们发现了醛基二芳烯BMFTP的溶剂变色效应：1在醇类溶剂中，醛基二芳烯分子闭环态吸收波长将会发生显著红移；2在不同溶剂中，醛基二芳烯闭环态吸收波长不同。

Dicyclopentadiene ; Cyclopentadiene ; Raney Nickel ; Liquid hydrogenation ; Cyclopentene

双环戊二烯；环戊二烯；骨架镍；液相加氢；环戊烯

The studies of radiation chemistry of three main components of garlic oil-diallyl sulfide, diallyl ...

本论文分别研究了大蒜油主要成份二烯丙基一硫、二烯丙基二硫和二烯丙基三硫化物乙醇溶液的辐射化学。

The studies of radiation chemistry of three main components of garlic oil-diallyl sulfide, diallyl disulfide and diallyl trisulfide were performed in ethanol.

本论文分别研究了大蒜油主要成份二烯丙基一硫、二烯丙基二硫和二烯丙基三硫化物乙醇溶液的辐射化学。

In this study,diallyl sulfides in garlic powder were identified via the introduction of Ag induced-ionization.

烯丙基硫化物由于弱极性不电离，本实验利用Ag+柱后诱导电离对大蒜粉剂中的含硫化合物进行质谱定性，并以二烯丙基三硫醚为参比，对各种二烯丙基含硫化合物进行定量测定。

Single dibasic acid can be identified by infrared spectroscopy while mixed dibasic acids have to be differentiated by paper chromatography in isopro-pan...

用顺丁烯二酸酐固化的环氧树脂经水解与分离后得到的主要是反丁烯二酸和少量顺丁烯二酸，前者的含量随固化温度的提高而增多，因而确证这一顺-反异构化反应是在固化过程中受热，而不是在水解，酸化时受化学试剂的作用产生的。

On the other hand, a method for the synthesis of-vinyl chalcogenides by the coupling of vinyl bromides with thiols or diphenyl diselenide using copper salts as catalysts in ionic liquids based on amino acids also has been described. The ionic liquids play multiple roles in the reaction: they act as solvent, base, and excellent promoter for the copper-catalyzed coupling reactions.

在新型的氨基酸负离子的离子液体中，开发了一个亚铜盐催化的Z-型溴代烯烃与硫族元素的交叉偶联反应，为立体选择性的制备Z-型烯基硫醚或烯基硒醚类化合物提供了一个新的方法；在此反应体系中，离子液体不仅起到了反应溶剂的作用，而且还起到了金属催化剂的配体和中和反应副产物的碱的作用。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。